facebook1 youtube1 twitter1 instagram linkedin1 pinterest1

NOTICE:  If you are not a free registered member of the site, you will not see the photos in the forum, and you won't be able to access our premium member content. Please consider joining our community! REGISTER AND MAKE THIS BOX DISAPPEAR!

×

Pictures Posting Not Working (12 Jun 2023)

Picture uploads is again unavailable. We are working on the problem. Thanks for your patience.

Makotosun

Stuck Piston

  • yamahahaha
  • yamahahaha's Avatar Topic Author
  • Offline
  • Site Supporter
  • Site Supporter
  • Posts: 964
  • Likes received: 275

Stuck Piston was created by yamahahaha

Got a stuck piston due to rust. In regards to my photo how much further down is the piston down stroke when running ? Hope I asked that right is the down stroke
Last edit: 01 Jun 2020 15:56 by yamahahaha.
01 Jun 2020 15:56 #1

This message has an attachment image.
Please log in or register to see it.

Please Log in or Create an account to join the conversation.

  • Posts: 1118
  • Likes received: 692

Replied by Swoop56 on topic Stuck Piston

It doesn't look to have completely uncovered the ports that I can see .
I'd expect there's still another 10-15 mm left before it hits the bottom of it's stroke .
Some penetrating oil around the bore might free it up . It might take a few applications to free .
The following user(s) Liked this Post: yamahahaha
01 Jun 2020 17:38 #2

Please Log in or Create an account to join the conversation.

  • Posts: 2141
  • Likes received: 1412

Replied by mdscott on topic Stuck Piston

That looks like its down all the way, even with the transfer ports, i think. Ive gotten several pistons out of frozen cylinders by lots of liquid wrench and removing the cylinder nuts while lifting the cylinder and hitting the piston with wood. Real common on the old Honda 90 engines.
Thanks Mark
Roseville, Ca.

'03 ST1300
'75 Norton
'73 CB500K
'81 Honda CT110
'87 PW50
'64 McClane Edger
'02 Honda XR70R
The following user(s) Liked this Post: Hammer, yamahahaha
01 Jun 2020 17:46 #3

Please Log in or Create an account to join the conversation.

  • yamahahaha
  • yamahahaha's Avatar Topic Author
  • Offline
  • Site Supporter
  • Site Supporter
  • Posts: 964
  • Likes received: 275

Replied by yamahahaha on topic Stuck Piston

Thanks Swoop and Mark... Yes I am a big fan of MMO and Kroil and some heat from my heat gun....I was thinking what you said Mark. I may need an extra set of hands to hit the piston while I pull up on the cylinder. Thanks guys.
01 Jun 2020 18:00 #4

Please Log in or Create an account to join the conversation.

  • Posts: 9639
  • Likes received: 3915

Replied by RT325 on topic Stuck Piston

Looks like it's almost there. Need a good strong flywheel holding tool to add some force to it but looks like you'll have to unbolt the cylinder & put blocks under it. Turn the crank to lift it all up, fit blocks then force the piston down. But it looks a bad case i must say. but might not be much rust lower down as piston is near the bottom. No use trying to turn the nut & needs more force than that. Here's a link to ages ago on my YG1T. The old girl ran perfect using same piston & rings. Might be a page before or after showing more. Can see the holding tool & had a pipe on that too--pretty brutal free or bust job. I can see the pipe looking again, but slid it out longer & thought something was going to break or shear a crank key, then felt a slight movement, so then other way, then see saw back & forth until it freed up. In saying that i think mine was more corrosion into the bore where yours is gross rust & lots of it. Also yours is on first oversize but i'm sure you've seen that.
www.yamaha-enduros.com/index.php/forums/...ildforums=1&start=60
The following user(s) Liked this Post: yamahahaha
Last edit: 01 Jun 2020 18:09 by RT325.
01 Jun 2020 18:02 #5

Please Log in or Create an account to join the conversation.

  • yamahahaha
  • yamahahaha's Avatar Topic Author
  • Offline
  • Site Supporter
  • Site Supporter
  • Posts: 964
  • Likes received: 275

Replied by yamahahaha on topic Stuck Piston


Thanks, yes the blocks under will eliminate needing an extra set of hands and sounds like my best bet...Just slow and easy but not to easy :whistle:
The following user(s) Liked this Post: RT325
01 Jun 2020 18:24 #6

Please Log in or Create an account to join the conversation.

  • Posts: 9639
  • Likes received: 3915

Replied by RT325 on topic Stuck Piston

Just thinking those deep nuts that hold it on are only alloy by memory so use a good fitting socket or a single hex socket as they can slip over if reluctant to crack free.
01 Jun 2020 19:49 #7

Please Log in or Create an account to join the conversation.

  • Posts: 3972
  • Likes received: 1911

Replied by Gr8uncleal on topic Stuck Piston

If you have an engine hoist, straps and can fashion a couple of brackets (I used 10mm thick mild steel), then you could try Gr8uncleal's method! :ROFLOL

Obviously the weight of my GT550 proved very useful here. The advantage of doing it "my" way is that you don't have to hit down on the crank.

Good luck!

The following user(s) Liked this Post: Hammer, RT325, mdscott, Super90, Lizeec
Last edit: 01 Jun 2020 23:29 by Gr8uncleal.
01 Jun 2020 23:28 #8

This message has attachments images.
Please log in or register to see it.

Please Log in or Create an account to join the conversation.

  • yamahahaha
  • yamahahaha's Avatar Topic Author
  • Offline
  • Site Supporter
  • Site Supporter
  • Posts: 964
  • Likes received: 275

Replied by yamahahaha on topic Stuck Piston

Ya I have a similar setup in our bedroom :woohoo:
The following user(s) Liked this Post: Mothersbaugh, Gr8uncleal, HouseofEnduro, Super90
02 Jun 2020 04:57 #9

Please Log in or Create an account to join the conversation.

  • Posts: 3972
  • Likes received: 1911

Replied by Gr8uncleal on topic Stuck Piston


The mind boggles..........!!:EEEK :EEEK :EEEK
02 Jun 2020 05:16 #10

Please Log in or Create an account to join the conversation.

Moderators: yamadminMakotosunDEETVinnieJames Hart